ZONE ALARMS
FOR GAS DETECTION AND OTHER MONITORING INPUTS |
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ZAMs save installation cost. No wiring is required to use ZAMs with the
Flexirack mounted Delphian gas monitoring systems. External
inputs require only a dry contact and a series resistor.
ZAMs provide special funcation contact outputs based upon the alarm status of one or more
monitoring points in a zone. A zone is a user-designated group of points which could be:
* Up to 15 gas detection channels in a Delphian Flexirack
* External monitoring inputs (contact closures). These could be flame, smoke, or heat
detectors.
* Any combination of both.ZAMs can share a Flexirack with up to 15 gas detection
controllers. They are field adjustable to monitor low, high and/or fail alarms from
controllers in the rack, and/or contact closure inputs from other sources. Alarm relay
outputs remain available from individual channels of Micro controllers even when ZAMs are
used.
No external wiring is required to use ZAMs with Flexirack mounted Delphian gas
detection systems. |
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CAM: Common
Alarm Module
A CAM is a simple means to provide a relay contact transfer whenever any one alarm occurs
in a zone. This "auxillary" relay automatically esets upon the disappearance of
all alarms in the zone. a typical application is to trip a remote alarm to advise
personnel to review the status of individual alarms.
A CAM can be used with up to 15 channels of gas detection in a Flexirack and with an
unlimited number of external inputs. |
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VAM: Voting
Alarm Module
A VAM provides a relay contact transfer when a specified minimum number of individual
alarms occur in a zone. This "auxillary" relay is field selectable to be
automatically or manually reset. Manual reset is done with a button on the VAM front panel
or with a remote reset switch
A typical application is to avoid costly tranxient alarms by requiring a "vote"
of two or more independent individual alarms before an expensive action is initiated (eg a
halon dump or plant shutdown). |
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SAM:
Sequential Acknowledgement Module
A SAM provides a relay contact transfer when any individual alarms occurs in a zone. When
a SAM alarm occurs, it can be acknowledged (reset) even if the individual alarm still
exists. Acknowledgement can be done with the button on the front panel or with a remote
reset switch. Subsequent alarms in the zone will reactivate the SAM alarm and can be
sequentially acknowledged.
A typical application is to sound a horn when an individual alarm occurs, then the silence
the horn while the source of the individual alarm is investigated. Meanwhile the plant is
still protected, since any new individual alarm will reactivate the horn. |
Zone
Alarm Module Part Numbers |
Flexiracks
Controllers
Glossary of Gas Detection Terms
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